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| Number | Title | Issue Date |
| 7432230 | Metallic soaps of modified fatty acids and rosin acids and methods of making and using same A superior powder form of a metallic soap for enhancing the properties of an invert emulsion drilling fluid may be prepared by a dry process saponification reaction. The process includes mixing a source of metal cations with the product of a Diels-Alder reaction of ... | 10/07/2008 |
| 7297662 | Method and composition for inhibiting lost circulation during well operation A method and drilling fluid additive composition are provided for reducing lost circulation and seepage loss when synthetic or oil based drilling fluid is used. The method includes injecting drilling fluid and 1 to 50 pounds per barrel of a loss control additive hav... | 11/20/2007 |
| 7285515 | Compositions of oil-based biodegradable drilling fluids and process for drilling oil and gas wells Compositions of oil-based biodegradable drilling fluids are described, the compositions comprising an oil phase composed by methyl esters of soybean oil fatty acids, an aqueous phase finely dispersed in the oil phase by specific emulsifiers and several other additiv... | 10/23/2007 |
| 7285519 | Oil production additive formulations Petroleum additive formulations include a petroleum additive dissolved in a carrier fluid including at least one compound of the formula (I): (R2)p-Ph-(CH2)m—COO—(AO)n—R1 where; R1 is... | 10/23/2007 |
| 7273832 | Alkali metal tungstate compositions and uses thereof Fluids, such as completion fluids, containing at least one alkali metal tungstate and optionally at least one chelating agent are described. Methods of removing a filter cake from a well bore surface, which may include one or more alkaline earth metal sulfates, is a... | 09/25/2007 |
| 7271132 | Metallic soaps of modified fatty acids and rosin acids and methods of making and using same A superior powder form of a metallic soap for enhancing the properties of an invert emulsion drilling fluid may be prepared by a dry process saponification reaction. The process includes mixing a source of metal cations with the product of a Diels-Alder reaction of ... | 09/18/2007 |
| 7196040 | Microcapsule well treatment A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release devi... | 03/27/2007 |
| 7137401 | Drag reduction using maleated fatty acids Non-polymeric drag reducing agents in the form of maleated fatty acids and the esters thereof and the organic, inorganic or amine salts thereof are described herein. These additives are useful to reduce drag in hydrocarbon fluids and multi-phase fluids of hydrocarbo... | 11/21/2006 |
| 7122507 | Drilling fluids and method of drilling Drilling, completing or workover of a well, particularly an oil and/or gas well, is carried out using a fluid which includes a continuous phase including an ester of the formula (I): (R2)p-Ph-(CH2)m—COO-(AO)n-... | 10/17/2006 |
| 7008907 | Additive for oil-based drilling fluids A method and product is disclosed which provides emulsion stability and filtration control to invert emulsion drilling fluids. The product comprises a blend of a carboxylic acid terminated polyamide and/or a wetting agent with a reaction product or mixture produced ... | 03/07/2006 |
| 6997270 | Compounds and method for generating a highly efficient membrane in water-based drilling fluids A method is disclosed that affords improved stability to wellbores during drilling in argillaceous formations with water-based drilling fluids. The method comprises adding to the drilling fluid a compound of the invention having the capacity in water to generate a h... | 02/14/2006 |
| 6887832 | Method of formulating and using a drilling mud with fragile gels A method for drilling, running casing in, and/or cementing a borehole in a subterranean formation without significant loss of drilling fluid is disclosed, as well as compositions for use in such method. The method employs a drilling fluid comprising a fragile gel or... | 05/03/2005 |
| 6884760 | Water based wellbore fluids The invention relates to water based wellbore fluids used during a hydrocarbon recovery process, such as drilling, fracturing, gravel packing and wellbore workover. According to the present invention, said wellbore fluid comprises a fluid loss additive and a bridgin... | 04/26/2005 |
| 6803347 | Additive for wellbore fluids A low molecular weight, high melting point, crystalline, oil soluble additive for use in wellbore fluids is provided that is preferably a ground crystalline material of melting point over 80° C., preferably over 100° C. which is readily soluble in produced hydroca... | 10/12/2004 |
| 6787505 | Electrically conductive non-aqueous wellbore fluids A wellbore fluid having a non-aqueous continuous liquid phase that exhibits an electrical conductivity of not less than 10 μS m−1 at 1 kHz comprises a polar organic liquid (POL) which exhibits a dielectric constant of at least about 5.0 and a Hildebran... | 09/07/2004 |
| 6620770 | Additive for oil-based drilling fluids A method and product is disclosed which provides emulsion stability and filtration control to invert emulsion drilling fluids. The product comprises a blend of a carboxylic acid terminated polyamide and a mixture produced by the Diels-Alder reaction of di... | 09/16/2003 |
| 5869433 | Non-fluorescing oil-based drilling fluid The present invention relates to an oil-based drilling fluid, a continuous phase for an oil-based drilling fluid, and additives for an oil-based drilling fluid. The drilling fluid, the continuous phase of the drilling fluid, and the additives for the oil-... | 02/09/1999 |
| 5827803 | Well treatment fluid A well treatment fluid comprising a mixture of (A) a major amount of a first hydrocarbon fluid, the first hydrocarbon fluid being composed predominantly of diaromatics and triaromatics having more than 16 carbon atoms, and (B) a minor amount of a second h... | 10/27/1998 |
| 5756772 | Reducing polyethercyclicpolyol metal adhesion Reduction of the adhesion of polyethercyclicpolyol (PECP) to metals by preparing the PECP by condensing polyol molecules by reactive distillation and replacing part of the polyol with an alcohol of lower hydroxyl content than the polyol.... | 05/26/1998 |
| 5710111 | Solids-free wellbore fluid Solids-free, essentially all-oil and invert emulsion wellbore fluids are employed in well drilling, completion, and workover operations. Techniques for remediating dense aromatic solvents wellbore fluids entail removal and/or dissolution of particulate ma... | 01/20/1998 |
| 5656576 | Reducing polyethercyclocpolyol metal adhesion Reducing the adherence of polyethercyclicpolyol to metal by exposing the metal to a selected surfactant.... | 08/12/1997 |
| 5635457 | Non-toxic, inexpensive synthetic drilling fluid A non-toxic, inexpensive synthetic fluid for use in wellbore fluids (e.g., drilling fluids) is selected from the group consisting of (A) fluids having (I) a pour point greater than about -30° C. (-22° F.) and (II) a cetane index greater than 50, and com... | 06/03/1997 |
| 5586608 | Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling A method of making a well fluid for use in a well which includes the steps of determining uphole and downhole operating temperatures in the well, and then contacting a well lubricant with a lubricating additive, wherein the lubricating additive has a clou... | 12/24/1996 |
| 5587354 | Drilling fluid and drilling fluid additive A drilling fluid additive comprises a monocyclic terpene, preferably d-limonene or dipentene, a bycyclic terpene such as 3-carene, or mixtures thereof and an oil such as mineral oil or vegetable oil. The additive is mixed in a water based drilling mud in ... | 12/24/1996 |
| 5559085 | Organic liquid base drilling fluid with terpene A drilling fluid comprises a continuous phase of diesel oil, mineral oil, ester, mono-ether, di-ether, poly-alpha-olefin, detergent alkylate, terpene and mixtures thereof. Water is added to make an inverted emulsion. In the non-terpene based drilling flui... | 09/24/1996 |
| 5189012 | Oil based synthetic hydrocarbon drilling fluid The present invention relates to an improved continuous phase for an oil based drilling fluid and specifically a synthetic hydrocarbon continuous phase which is non-polluting and minimally toxic. The invention provides excellent drilling fluid properties ... | 02/23/1993 |
| 5007489 | Drilling fluid methods and composition A method is provided for the prevention of balling of formation cuttings upon the surface of drilling equipment and for lubrication of said equipment used in conjunction with subterranean well operations. An aqueous system is prepared to which is added a ... | 04/16/1991 |
| 4915174 | Concentrated suspensions of water soluble polymers The invention provides concentrated suspensions of high molecular weight water soluble polymers comprising a high molecular weight water soluble polymer, a nonpolymer solvating organic diluent, a swelling agent and a low molecular weight polymer adjuvant,... | 04/10/1990 |
| 4910246 | Intercalations of crystalline lithium aluminates Useful compositions are prepared by incorporating into organic materials, crystalline lithium aluminates which conform substantially to the empirical formula (LiAx)y.2Al(OH)3.nH.sub.2 O where A represents one or more anions and... | 03/20/1990 |
| 4900456 | Well bore fluid A method for the completion or work-over of a well comprises the step of using a solids-free, non-aqueous well-bore fluid comprising a halogenated organic compound as a completion or work-over fluid. The fluid has a specific gravity in the range 0.9 to 2.... | 02/13/1990 |
| 4891177 | Water-flood surfactant A water-flood surfactant and the method of making it which comprises the steps of mixing, in a reactor, sodium hydroxide with a sulfonated natural petroleum crude, the sodium hydroxide being in excess of the amount required to convert the sulfonate to phe... | 01/02/1990 |
| 4876030 | Organophilic clay suspension medium A novel organophilic clay suspension medium prepared by admixing an organophilic clay with a hydrocarbon oil and an activator selected from the group consisting of phenyl hydroxyalkyl ethers and phenylalkanols. Optionally water may be added to the admixtu... | 10/24/1989 |
| 4799549 | Gel-forming aqueous microemulsions for soil stabilization Stable, gel-forming aqueous microemulsions, well adopted for the reversible stabilization or plugging of soil/rock formations, e.g., subterranean well formations, are comprised of (i) an aqueous solution of a water-soluble alkali metal silicate, (ii) a ge... | 01/24/1989 |
| 4787990 | Low toxicity oil-based drilling fluid Disclosed is a low toxicity oil for use in drilling fluids. The oil consists essentially of branched- and cyclic-paraffins having 11 to 17 carbon atoms per molecule and further having a low aromatic content of less than about 1% and a low normal-paraffin ... | 11/29/1988 |
| 4743383 | Drilling fluid additives for use in hard brine environments A drilling fluid additive is disclosed which will prevent water loss into subterranean formations during the drilling of oil and gas wells in hard brine environments. The drilling fluid additive comprises a hydrocarbon, an anionic surfactant, an alcohol, ... | 05/10/1988 |
| 4735731 | Process for reversible thickening of a liquid Industrial liquids containing viscoelastic surfactant compositions can be reversibly thickened and broken. For example, a thickened industrial liquid can exhibit good solids carrying capacity, and after the viscosity of the liquid is broken, using techniq... | 04/05/1988 |
| 4690996 | Inverse emulsions Polysaccharide graft copolymers are prepared by a water-in-oil emulsion polymerization process in which the polysaccharide and water-soluble monomer are emulsified in an oil phase containing emulsifying agents and polymerized therein. The resultant emulsi... | 09/01/1987 |
| 4670164 | Liquid polymer containing compositions for thickening aqueous systems A liquid polymer containing composition, useful as a thickening agent for aqueous systems, containing hydroxyethyl cellulose, a hydrophobic liquid medium in which the hydroxyethyl cellulose is substantially non-swellable and a gelling agent for thickening... | 06/02/1987 |
| 4664820 | Preactivated organophilic clay gellant lubricating grease thickened with preactivated organophilic clay gellant and process for preparing preactivated organophilic clay gellants A preactivated organophilic clay gellant that may be used to thicken organic compositions, especially, lubricating greases without the presence of a polar activator. The preactivated organophilic clay gellant may be prepared using certain process paramete... | 05/12/1987 |
| 4657593 | Modifying surface tension of finely-divided materials in a liquid The present invention provides acid group-containing, thermostable, hydrophilic condensation products of aldehydes and ketones, wherein the ketones used are symmetrical or asymmetrical ketones with acyclic aliphatic, araliphatic and/or aromatic radicals, ... | 04/14/1987 |
